mirror of https://github.com/Icinga/icinga2.git
1955 lines
74 KiB
Markdown
1955 lines
74 KiB
Markdown
# <a id="monitoring-basics"></a> Monitoring Basics
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This part of the Icinga 2 documentation provides an overview of all the basic
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monitoring concepts you need to know to run Icinga 2.
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Keep in mind these examples are made with a linux server in mind, if you are
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using Windows you will need to change the services accordingly. See the [ITL reference](7-icinga-template-library.md#windows-plugins)
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for further information.
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## <a id="hosts-services"></a> Hosts and Services
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Icinga 2 can be used to monitor the availability of hosts and services. Hosts
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and services can be virtually anything which can be checked in some way:
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* Network services (HTTP, SMTP, SNMP, SSH, etc.)
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* Printers
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* Switches / routers
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* Temperature sensors
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* Other local or network-accessible services
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Host objects provide a mechanism to group services that are running
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on the same physical device.
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Here is an example of a host object which defines two child services:
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object Host "my-server1" {
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address = "10.0.0.1"
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check_command = "hostalive"
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}
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object Service "ping4" {
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host_name = "my-server1"
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check_command = "ping4"
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}
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object Service "http" {
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host_name = "my-server1"
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check_command = "http"
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}
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The example creates two services `ping4` and `http` which belong to the
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host `my-server1`.
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It also specifies that the host should perform its own check using the `hostalive`
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check command.
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The `address` attribute is used by check commands to determine which network
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address is associated with the host object.
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Details on troubleshooting check problems can be found [here](17-troubleshooting.md#troubleshooting).
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### <a id="host-states"></a> Host States
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Hosts can be in any of the following states:
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Name | Description
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------------|--------------
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UP | The host is available.
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DOWN | The host is unavailable.
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### <a id="service-states"></a> Service States
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Services can be in any of the following states:
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Name | Description
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------------|--------------
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OK | The service is working properly.
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WARNING | The service is experiencing some problems but is still considered to be in working condition.
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CRITICAL | The service is in a critical state.
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UNKNOWN | The check could not determine the service's state.
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### <a id="hard-soft-states"></a> Hard and Soft States
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When detecting a problem with a host/service Icinga re-checks the object a number of
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times (based on the `max_check_attempts` and `retry_interval` settings) before sending
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notifications. This ensures that no unnecessary notifications are sent for
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transient failures. During this time the object is in a `SOFT` state.
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After all re-checks have been executed and the object is still in a non-OK
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state the host/service switches to a `HARD` state and notifications are sent.
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Name | Description
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------------|--------------
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HARD | The host/service's state hasn't recently changed.
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SOFT | The host/service has recently changed state and is being re-checked.
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### <a id="host-service-checks"></a> Host and Service Checks
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Hosts and services determine their state by running checks in a regular interval.
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object Host "router" {
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check_command = "hostalive"
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address = "10.0.0.1"
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}
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The `hostalive` command is one of several built-in check commands. It sends ICMP
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echo requests to the IP address specified in the `address` attribute to determine
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whether a host is online.
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A number of other [built-in check commands](7-icinga-template-library.md#plugin-check-commands) are also
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available. In addition to these commands the next few chapters will explain in
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detail how to set up your own check commands.
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## <a id="object-inheritance-using-templates"></a> Templates
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Templates may be used to apply a set of identical attributes to more than one
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object:
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template Service "generic-service" {
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max_check_attempts = 3
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check_interval = 5m
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retry_interval = 1m
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enable_perfdata = true
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}
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apply Service "ping4" {
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import "generic-service"
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check_command = "ping4"
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assign where host.address
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}
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apply Service "ping6" {
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import "generic-service"
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check_command = "ping6"
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assign where host.address6
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}
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In this example the `ping4` and `ping6` services inherit properties from the
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template `generic-service`.
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Objects as well as templates themselves can import an arbitrary number of
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other templates. Attributes inherited from a template can be overridden in the
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object if necessary.
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You can also import existing non-template objects. Note that templates
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and objects share the same namespace, i.e. you can't define a template
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that has the same name like an object.
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## <a id="custom-attributes"></a> Custom Attributes
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In addition to built-in attributes you can define your own attributes:
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object Host "localhost" {
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vars.ssh_port = 2222
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}
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Valid values for custom attributes include:
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* [Strings](20-language-reference.md#string-literals), [numbers](20-language-reference.md#numeric-literals) and [booleans](20-language-reference.md#boolean-literals)
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* [Arrays](20-language-reference.md#array) and [dictionaries](20-language-reference.md#dictionary)
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* [Functions](3-monitoring-basics.md#custom-attributes-functions)
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### <a id="custom-attributes-functions"></a> Functions as Custom Attributes
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Icinga 2 lets you specify [functions](20-language-reference.md#functions) for custom attributes.
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The special case here is that whenever Icinga 2 needs the value for such a custom attribute it runs
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the function and uses whatever value the function returns:
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object CheckCommand "random-value" {
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import "plugin-check-command"
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command = [ PluginDir + "/check_dummy", "0", "$text$" ]
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vars.text = {{ Math.random() * 100 }}
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}
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This example uses the [abbreviated lambda syntax](20-language-reference.md#nullary-lambdas).
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These functions have access to a number of variables:
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Variable | Description
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-------------|---------------
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user | The User object (for notifications).
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service | The Service object (for service checks/notifications/event handlers).
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host | The Host object.
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command | The command object (e.g. a CheckCommand object for checks).
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Here's an example:
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vars.text = {{ host.check_interval }}
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In addition to these variables the `macro` function can be used to retrieve the
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value of arbitrary macro expressions:
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vars.text = {{
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if (macro("$address$") == "127.0.0.1") {
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log("Running a check for localhost!")
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}
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return "Some text"
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}}
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The `resolve_arguments` can be used to resolve a command and its arguments much in
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the same fashion Icinga does this for the `command` and `arguments` attributes for
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commands. The `by_ssh` command uses this functionality to let users specify a
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command and arguments that should be executed via SSH:
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arguments = {
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"-C" = {{
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var command = macro("$by_ssh_command$")
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var arguments = macro("$by_ssh_arguments$")
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if (typeof(command) == String && !arguments) {
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return command
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}
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var escaped_args = []
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for (arg in resolve_arguments(command, arguments)) {
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escaped_args.add(escape_shell_arg(arg))
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}
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return escaped_args.join(" ")
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}}
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...
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}
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Acessing object attributes at runtime inside these functions is described in the
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[advanced topics](5-advanced-topics.md#access-object-attributes-at-runtime) chapter.
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## <a id="runtime-macros"></a> Runtime Macros
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Macros can be used to access other objects' attributes at runtime. For example they
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are used in command definitions to figure out which IP address a check should be
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run against:
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object CheckCommand "my-ping" {
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import "plugin-check-command"
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command = [ PluginDir + "/check_ping", "-H", "$ping_address$" ]
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arguments = {
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"-w" = "$ping_wrta$,$ping_wpl$%"
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"-c" = "$ping_crta$,$ping_cpl$%"
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"-p" = "$ping_packets$"
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}
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vars.ping_address = "$address$"
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vars.ping_wrta = 100
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vars.ping_wpl = 5
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vars.ping_crta = 250
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vars.ping_cpl = 10
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vars.ping_packets = 5
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}
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object Host "router" {
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check_command = "my-ping"
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address = "10.0.0.1"
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}
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In this example we are using the `$address$` macro to refer to the host's `address`
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attribute.
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We can also directly refer to custom attributes, e.g. by using `$ping_wrta$`. Icinga
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automatically tries to find the closest match for the attribute you specified. The
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exact rules for this are explained in the next section.
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### <a id="macro-evaluation-order"></a> Evaluation Order
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When executing commands Icinga 2 checks the following objects in this order to look
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up macros and their respective values:
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1. User object (only for notifications)
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2. Service object
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3. Host object
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4. Command object
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5. Global custom attributes in the `Vars` constant
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This execution order allows you to define default values for custom attributes
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in your command objects.
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Here's how you can override the custom attribute `ping_packets` from the previous
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example:
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object Service "ping" {
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host_name = "localhost"
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check_command = "my-ping"
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vars.ping_packets = 10 // Overrides the default value of 5 given in the command
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}
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If a custom attribute isn't defined anywhere an empty value is used and a warning is
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written to the Icinga 2 log.
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You can also directly refer to a specific attribute - thereby ignoring these evaluation
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rules - by specifying the full attribute name:
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$service.vars.ping_wrta$
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This retrieves the value of the `ping_wrta` custom attribute for the service. This
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returns an empty value if the service does not have such a custom attribute no matter
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whether another object such as the host has this attribute.
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### <a id="host-runtime-macros"></a> Host Runtime Macros
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The following host custom attributes are available in all commands that are executed for
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hosts or services:
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Name | Description
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-----------------------------|--------------
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host.name | The name of the host object.
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host.display_name | The value of the `display_name` attribute.
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host.state | The host's current state. Can be one of `UNREACHABLE`, `UP` and `DOWN`.
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host.state_id | The host's current state. Can be one of `0` (up), `1` (down) and `2` (unreachable).
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host.state_type | The host's current state type. Can be one of `SOFT` and `HARD`.
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host.check_attempt | The current check attempt number.
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host.max_check_attempts | The maximum number of checks which are executed before changing to a hard state.
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host.last_state | The host's previous state. Can be one of `UNREACHABLE`, `UP` and `DOWN`.
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host.last_state_id | The host's previous state. Can be one of `0` (up), `1` (down) and `2` (unreachable).
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host.last_state_type | The host's previous state type. Can be one of `SOFT` and `HARD`.
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host.last_state_change | The last state change's timestamp.
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host.downtime_depth | The number of active downtimes.
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host.duration_sec | The time since the last state change.
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host.latency | The host's check latency.
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host.execution_time | The host's check execution time.
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host.output | The last check's output.
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host.perfdata | The last check's performance data.
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host.last_check | The timestamp when the last check was executed.
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host.check_source | The monitoring instance that performed the last check.
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host.num_services | Number of services associated with the host.
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host.num_services_ok | Number of services associated with the host which are in an `OK` state.
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host.num_services_warning | Number of services associated with the host which are in a `WARNING` state.
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host.num_services_unknown | Number of services associated with the host which are in an `UNKNOWN` state.
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host.num_services_critical | Number of services associated with the host which are in a `CRITICAL` state.
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### <a id="service-runtime-macros"></a> Service Runtime Macros
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The following service macros are available in all commands that are executed for
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services:
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Name | Description
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---------------------------|--------------
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service.name | The short name of the service object.
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service.display_name | The value of the `display_name` attribute.
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service.check_command | The short name of the command along with any arguments to be used for the check.
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service.state | The service's current state. Can be one of `OK`, `WARNING`, `CRITICAL` and `UNKNOWN`.
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service.state_id | The service's current state. Can be one of `0` (ok), `1` (warning), `2` (critical) and `3` (unknown).
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service.state_type | The service's current state type. Can be one of `SOFT` and `HARD`.
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service.check_attempt | The current check attempt number.
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service.max_check_attempts | The maximum number of checks which are executed before changing to a hard state.
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service.last_state | The service's previous state. Can be one of `OK`, `WARNING`, `CRITICAL` and `UNKNOWN`.
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service.last_state_id | The service's previous state. Can be one of `0` (ok), `1` (warning), `2` (critical) and `3` (unknown).
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service.last_state_type | The service's previous state type. Can be one of `SOFT` and `HARD`.
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service.last_state_change | The last state change's timestamp.
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service.downtime_depth | The number of active downtimes.
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service.duration_sec | The time since the last state change.
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service.latency | The service's check latency.
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service.execution_time | The service's check execution time.
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service.output | The last check's output.
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service.perfdata | The last check's performance data.
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service.last_check | The timestamp when the last check was executed.
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service.check_source | The monitoring instance that performed the last check.
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### <a id="command-runtime-macros"></a> Command Runtime Macros
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The following custom attributes are available in all commands:
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Name | Description
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-----------------------|--------------
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command.name | The name of the command object.
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### <a id="user-runtime-macros"></a> User Runtime Macros
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The following custom attributes are available in all commands that are executed for
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users:
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Name | Description
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-----------------------|--------------
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user.name | The name of the user object.
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user.display_name | The value of the display_name attribute.
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### <a id="notification-runtime-macros"></a> Notification Runtime Macros
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Name | Description
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-----------------------|--------------
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notification.type | The type of the notification.
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notification.author | The author of the notification comment, if existing.
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notification.comment | The comment of the notification, if existing.
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### <a id="global-runtime-macros"></a> Global Runtime Macros
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The following macros are available in all executed commands:
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Name | Description
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-----------------------|--------------
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icinga.timet | Current UNIX timestamp.
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icinga.long_date_time | Current date and time including timezone information. Example: `2014-01-03 11:23:08 +0000`
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icinga.short_date_time | Current date and time. Example: `2014-01-03 11:23:08`
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icinga.date | Current date. Example: `2014-01-03`
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icinga.time | Current time including timezone information. Example: `11:23:08 +0000`
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icinga.uptime | Current uptime of the Icinga 2 process.
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The following macros provide global statistics:
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Name | Description
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----------------------------------|--------------
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icinga.num_services_ok | Current number of services in state 'OK'.
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icinga.num_services_warning | Current number of services in state 'Warning'.
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icinga.num_services_critical | Current number of services in state 'Critical'.
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icinga.num_services_unknown | Current number of services in state 'Unknown'.
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icinga.num_services_pending | Current number of pending services.
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icinga.num_services_unreachable | Current number of unreachable services.
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icinga.num_services_flapping | Current number of flapping services.
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icinga.num_services_in_downtime | Current number of services in downtime.
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icinga.num_services_acknowledged | Current number of acknowledged service problems.
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icinga.num_hosts_up | Current number of hosts in state 'Up'.
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icinga.num_hosts_down | Current number of hosts in state 'Down'.
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icinga.num_hosts_unreachable | Current number of unreachable hosts.
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icinga.num_hosts_flapping | Current number of flapping hosts.
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icinga.num_hosts_in_downtime | Current number of hosts in downtime.
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icinga.num_hosts_acknowledged | Current number of acknowledged host problems.
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## <a id="using-apply"></a> Apply Rules
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Instead of assigning each object ([Service](6-object-types.md#objecttype-service),
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[Notification](6-object-types.md#objecttype-notification), [Dependency](6-object-types.md#objecttype-dependency),
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[ScheduledDowntime](6-object-types.md#objecttype-scheduleddowntime))
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based on attribute identifiers for example `host_name` objects can be [applied](20-language-reference.md#apply).
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Before you start using the apply rules keep the following in mind:
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* Define the best match.
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* A set of unique [custom attributes](3-monitoring-basics.md#custom-attributes) for these hosts/services?
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* Or [group](3-monitoring-basics.md#groups) memberships, e.g. a host being a member of a hostgroup, applying services to it?
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* A generic pattern [match](20-language-reference.md#function-calls) on the host/service name?
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* [Multiple expressions combined](3-monitoring-basics.md#using-apply-expressions) with `&&` or `||` [operators](20-language-reference.md#expression-operators)
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* All expressions must return a boolean value (an empty string is equal to `false` e.g.)
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> **Note**
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>
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> You can set/override object attributes in apply rules using the respectively available
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> objects in that scope (host and/or service objects).
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[Custom attributes](3-monitoring-basics.md#custom-attributes) can also store nested dictionaries and arrays. That way you can use them
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for not only matching for their existance or values in apply expressions, but also assign
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("inherit") their values into the generated objected from apply rules.
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* [Apply services to hosts](3-monitoring-basics.md#using-apply-services)
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* [Apply notifications to hosts and services](3-monitoring-basics.md#using-apply-notifications)
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* [Apply dependencies to hosts and services](3-monitoring-basics.md#using-apply-dependencies)
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* [Apply scheduled downtimes to hosts and services](3-monitoring-basics.md#using-apply-scheduledowntimes)
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A more advanced example is using [apply with for loops on arrays or
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dictionaries](3-monitoring-basics.md#using-apply-for) for example provided by
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[custom atttributes](3-monitoring-basics.md#custom-attributes) or groups.
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> **Tip**
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>
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> Building configuration in that dynamic way requires detailed information
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> of the generated objects. Use the `object list` [CLI command](8-cli-commands.md#cli-command-object)
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> after successful [configuration validation](8-cli-commands.md#config-validation).
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### <a id="using-apply-expressions"></a> Apply Rules Expressions
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You can use simple or advanced combinations of apply rule expressions. Each
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expression must evaluate into the boolean `true` value. An empty string
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will be for instance interpreted as `false`. In a similar fashion undefined
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attributes will return `false`.
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Returns `false`:
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assign where host.vars.attribute_does_not_exist
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Multiple `assign where` condition rows are evaluated as `OR` condition.
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You can combine multiple expressions for matching only a subset of objects. In some cases,
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|
you want to be able to add more than one assign/ignore where expression which matches
|
|
a specific condition. To achieve this you can use the logical `and` and `or` operators.
|
|
|
|
|
|
Match all `*mysql*` patterns in the host name and (`&&`) custom attribute `prod_mysql_db`
|
|
matches the `db-*` pattern. All hosts with the custom attribute `test_server` set to `true`
|
|
should be ignored, or any host name ending with `*internal` pattern.
|
|
|
|
object HostGroup "mysql-server" {
|
|
display_name = "MySQL Server"
|
|
|
|
assign where match("*mysql*", host.name) && match("db-*", host.vars.prod_mysql_db)
|
|
ignore where host.vars.test_server == true
|
|
ignore where match("*internal", host.name)
|
|
}
|
|
|
|
Similar example for advanced notification apply rule filters: If the service
|
|
attribute `notes` contains the `has gold support 24x7` string `AND` one of the
|
|
two condition passes: Either the `customer` host custom attribute is set to `customer-xy`
|
|
`OR` the host custom attribute `always_notify` is set to `true`.
|
|
|
|
The notification is ignored for services whose host name ends with `*internal`
|
|
`OR` the `priority` custom attribute is [less than](20-language-reference.md#expression-operators) `2`.
|
|
|
|
template Notification "cust-xy-notification" {
|
|
users = [ "noc-xy", "mgmt-xy" ]
|
|
command = "mail-service-notification"
|
|
}
|
|
|
|
apply Notification "notify-cust-xy-mysql" to Service {
|
|
import "cust-xy-notification"
|
|
|
|
assign where match("*has gold support 24x7*", service.notes) && (host.vars.customer == "customer-xy" || host.vars.always_notify == true)
|
|
ignore where match("*internal", host.name) || (service.vars.priority < 2 && host.vars.is_clustered == true)
|
|
}
|
|
|
|
### <a id="using-apply-services"></a> Apply Services to Hosts
|
|
|
|
The sample configuration already includes a detailed example in [hosts.conf](4-configuring-icinga-2.md#hosts-conf)
|
|
and [services.conf](4-configuring-icinga-2.md#services-conf) for this use case.
|
|
|
|
The example for `ssh` applies a service object to all hosts with the `address`
|
|
attribute being defined and the custom attribute `os` set to the string `Linux` in `vars`.
|
|
|
|
apply Service "ssh" {
|
|
import "generic-service"
|
|
|
|
check_command = "ssh"
|
|
|
|
assign where host.address && host.vars.os == "Linux"
|
|
}
|
|
|
|
|
|
Other detailed scenario examples are used in their respective chapters, for example
|
|
[apply services with custom command arguments](3-monitoring-basics.md#command-passing-parameters).
|
|
|
|
### <a id="using-apply-notifications"></a> Apply Notifications to Hosts and Services
|
|
|
|
Notifications are applied to specific targets (`Host` or `Service`) and work in a similar
|
|
manner:
|
|
|
|
|
|
apply Notification "mail-noc" to Service {
|
|
import "mail-service-notification"
|
|
|
|
user_groups = [ "noc" ]
|
|
|
|
assign where host.vars.notification.mail
|
|
}
|
|
|
|
|
|
In this example the `mail-noc` notification will be created as object for all services having the
|
|
`notification.mail` custom attribute defined. The notification command is set to `mail-service-notification`
|
|
and all members of the user group `noc` will get notified.
|
|
|
|
It is also possible to generally apply a notification template and dynamically overwrite values from
|
|
the template by checking for custom attributes. This can be achieved by using [conditional statements](20-language-reference.md#conditional-statements):
|
|
|
|
apply Notification "host-mail-noc" to Host {
|
|
import "mail-host-notification"
|
|
|
|
// replace interval inherited from `mail-host-notification` template with new notfication interval set by a host custom attribute
|
|
if (host.vars.notification_interval) {
|
|
interval = host.vars.notification_interval
|
|
}
|
|
|
|
// same with notification period
|
|
if (host.vars.notification_period) {
|
|
interval = host.vars.notification_period
|
|
}
|
|
|
|
// Send SMS instead of email if the host's custom attribute `notification_type` is set to `sms`
|
|
if (host.vars.notification_type == "sms") {
|
|
command = "sms-host-notification"
|
|
} else {
|
|
command = "mail-host-notification"
|
|
}
|
|
|
|
user_groups = [ "noc" ]
|
|
|
|
assign where host.address
|
|
}
|
|
|
|
In the example above, the notification template `mail-host-notification`, which contains all relevant
|
|
notification settings, is applied on all host objects where the `host.address` is defined.
|
|
Each host object is then checked for custom attributes (`host.vars.notification_interval`,
|
|
`host.vars.notification_period` and `host.vars.notification_type`). Depending if the custom
|
|
attibute is set or which value it has, the value from the notification template is dynamically
|
|
overwritten.
|
|
|
|
The corresponding Host object could look like this:
|
|
|
|
object Host "host1" {
|
|
import "host-linux-prod"
|
|
display_name = "host1"
|
|
address = "192.168.1.50"
|
|
vars.notification_interval = 1h
|
|
vars.notification_period = "24x7"
|
|
vars.notification_type = "sms"
|
|
}
|
|
|
|
### <a id="using-apply-dependencies"></a> Apply Dependencies to Hosts and Services
|
|
|
|
Detailed examples can be found in the [dependencies](3-monitoring-basics.md#dependencies) chapter.
|
|
|
|
### <a id="using-apply-scheduledowntimes"></a> Apply Recurring Downtimes to Hosts and Services
|
|
|
|
The sample configuration includes an example in [downtimes.conf](4-configuring-icinga-2.md#downtimes-conf).
|
|
|
|
Detailed examples can be found in the [recurring downtimes](5-advanced-topics.md#recurring-downtimes) chapter.
|
|
|
|
|
|
### <a id="using-apply-for"></a> Using Apply For Rules
|
|
|
|
Next to the standard way of using [apply rules](3-monitoring-basics.md#using-apply)
|
|
there is the requirement of generating apply rules objects based on set (array or
|
|
dictionary).
|
|
|
|
The sample configuration already includes a detailed example in [hosts.conf](4-configuring-icinga-2.md#hosts-conf)
|
|
and [services.conf](4-configuring-icinga-2.md#services-conf) for this use case.
|
|
|
|
Take the following example: A host provides the snmp oids for different service check
|
|
types. This could look like the following example:
|
|
|
|
object Host "router-v6" {
|
|
check_command = "hostalive"
|
|
address6 = "::1"
|
|
|
|
vars.oids["if01"] = "1.1.1.1.1"
|
|
vars.oids["temp"] = "1.1.1.1.2"
|
|
vars.oids["bgp"] = "1.1.1.1.5"
|
|
}
|
|
|
|
Now we want to create service checks for `if01` and `temp` but not `bgp`.
|
|
Furthermore we want to pass the snmp oid stored as dictionary value to the
|
|
custom attribute called `vars.snmp_oid` - this is the command argument required
|
|
by the [snmp](7-icinga-template-library.md#plugin-check-command-snmp) check command.
|
|
The service's `display_name` should be set to the identifier inside the dictionary.
|
|
|
|
apply Service for (identifier => oid in host.vars.oids) {
|
|
check_command = "snmp"
|
|
display_name = identifier
|
|
vars.snmp_oid = oid
|
|
|
|
ignore where identifier == "bgp" //don't generate service for bgp checks
|
|
}
|
|
|
|
Icinga 2 evaluates the `apply for` rule for all objects with the custom attribute
|
|
`oids` set. It then iterates over all list items inside the `for` loop and evaluates the
|
|
`assign/ignore where` expressions. You can access the loop variable
|
|
in these expressions, e.g. for ignoring certain values.
|
|
In this example we'd ignore the `bgp` identifier and avoid generating an unwanted service.
|
|
We could extend the configuration by also matching the `oid` value on certain regex/wildcard
|
|
patterns for example.
|
|
|
|
> **Note**
|
|
>
|
|
> You don't need an `assign where` expression only checking for existance
|
|
> of the custom attribute.
|
|
|
|
That way you'll save duplicated apply rules by combining them into one
|
|
generic `apply for` rule generating the object name with or without a prefix.
|
|
|
|
|
|
#### <a id="using-apply-for-custom-attribute-override"></a> Apply For and Custom Attribute Override
|
|
|
|
Imagine a different more advanced example: You are monitoring your network device (host)
|
|
with many interfaces (services). The following requirements/problems apply:
|
|
|
|
* Each interface service check should be named with a prefix and a name defined in your host object (which could be generated from your CMDB, etc)
|
|
* Each interface has its own vlan tag
|
|
* Some interfaces have QoS enabled
|
|
* Additional attributes such as `display_name` or `notes, `notes_url` and `action_url` must be
|
|
dynamically generated
|
|
|
|
|
|
Tip: Define the snmp community as global constant in your [constants.conf](4-configuring-icinga-2.md#constants-conf) file.
|
|
|
|
const IftrafficSnmpCommunity = "public"
|
|
|
|
By defining the `interfaces` dictionary with three example interfaces on the `cisco-catalyst-6509-34`
|
|
host object, you'll make sure to pass the [custom attribute](3-monitoring-basics.md#custom-attributes)
|
|
storage required by the for loop in the service apply rule.
|
|
|
|
object Host "cisco-catalyst-6509-34" {
|
|
import "generic-host"
|
|
display_name = "Catalyst 6509 #34 VIE21"
|
|
address = "127.0.1.4"
|
|
|
|
/* "GigabitEthernet0/2" is the interface name,
|
|
* and key name in service apply for later on
|
|
*/
|
|
vars.interfaces["GigabitEthernet0/2"] = {
|
|
/* define all custom attributes with the
|
|
* same name required for command parameters/arguments
|
|
* in service apply (look into your CheckCommand definition)
|
|
*/
|
|
iftraffic_units = "g"
|
|
iftraffic_community = IftrafficSnmpCommunity
|
|
iftraffic_bandwidth = 1
|
|
vlan = "internal"
|
|
qos = "disabled"
|
|
}
|
|
vars.interfaces["GigabitEthernet0/4"] = {
|
|
iftraffic_units = "g"
|
|
//iftraffic_community = IftrafficSnmpCommunity
|
|
iftraffic_bandwidth = 1
|
|
vlan = "renote"
|
|
qos = "enabled"
|
|
}
|
|
vars.interfaces["MgmtInterface1"] = {
|
|
iftraffic_community = IftrafficSnmpCommunity
|
|
vlan = "mgmt"
|
|
interface_address = "127.99.0.100" #special management ip
|
|
}
|
|
}
|
|
|
|
You can also omit the `"if-"` string, then all generated service names are directly
|
|
taken from the `if_name` variable value.
|
|
|
|
The config dictionary contains all key-value pairs for the specific interface in one
|
|
loop cycle, like `iftraffic_units`, `vlan`, and `qos` for the specified interface.
|
|
|
|
You can either map the custom attributes from the `interface_config` dictionary to
|
|
local custom attributes stashed into `vars`. If the names match the required command
|
|
argument parameters already (for example `iftraffic_units`), you could also add the
|
|
`interface_config` dictionary to the `vars` dictionary using the `+=` operator.
|
|
|
|
After `vars` is fully populated, all object attributes can be set calculated from
|
|
provided host attributes. For strings, you can use string concatention with the `+` operator.
|
|
|
|
You can also specifiy the display_name, check command, interval, notes, notes_url, action_url, etc.
|
|
attributes that way. Attribute strings can be [concatenated](20-language-reference.md#expression-operators),
|
|
for example for adding a more detailed service `display_name`.
|
|
|
|
This example also uses [if conditions](20-language-reference.md#conditional-statements)
|
|
if specific values are not set, adding a local default value.
|
|
The other way around you can override specific custom attributes inherited from a service template,
|
|
if set.
|
|
|
|
/* loop over the host.vars.interfaces dictionary
|
|
* for (key => value in dict) means `interface_name` as key
|
|
* and `interface_config` as value. Access config attributes
|
|
* with the indexer (`.`) character.
|
|
*/
|
|
apply Service "if-" for (interface_name => interface_config in host.vars.interfaces) {
|
|
import "generic-service"
|
|
check_command = "iftraffic"
|
|
display_name = "IF-" + interface_name
|
|
|
|
/* use the key as command argument (no duplication of values in host.vars.interfaces) */
|
|
vars.iftraffic_interface = interface_name
|
|
|
|
/* map the custom attributes as command arguments */
|
|
vars.iftraffic_units = interface_config.iftraffic_units
|
|
vars.iftraffic_community = interface_config.iftraffic_community
|
|
|
|
/* the above can be achieved in a shorter fashion if the names inside host.vars.interfaces
|
|
* are the _exact_ same as required as command parameter by the check command
|
|
* definition.
|
|
*/
|
|
vars += interface_config
|
|
|
|
/* set a default value for units and bandwidth */
|
|
if (interface_config.iftraffic_units == "") {
|
|
vars.iftraffic_units = "m"
|
|
}
|
|
if (interface_config.iftraffic_bandwidth == "") {
|
|
vars.iftraffic_bandwidth = 1
|
|
}
|
|
if (interface_config.vlan == "") {
|
|
vars.vlan = "not set"
|
|
}
|
|
if (interface_config.qos == "") {
|
|
vars.qos = "not set"
|
|
}
|
|
|
|
/* set the global constant if not explicitely
|
|
* not provided by the `interfaces` dictionary on the host
|
|
*/
|
|
if (len(interface_config.iftraffic_community) == 0 || len(vars.iftraffic_community) == 0) {
|
|
vars.iftraffic_community = IftrafficSnmpCommunity
|
|
}
|
|
|
|
/* Calculate some additional object attributes after populating the `vars` dictionary */
|
|
notes = "Interface check for " + interface_name + " (units: '" + interface_config.iftraffic_units + "') in VLAN '" + vars.vlan + "' with ' QoS '" + vars.qos + "'"
|
|
notes_url = "http://foreman.company.com/hosts/" + host.name
|
|
action_url = "http://snmp.checker.company.com/" + host.name + "/if-" + interface_name
|
|
}
|
|
|
|
|
|
|
|
This example makes use of the [check_iftraffic](https://exchange.icinga.org/exchange/iftraffic) plugin.
|
|
The `CheckCommand` definition can be found in the
|
|
[contributed plugin check commands](7-icinga-template-library.md#plugins-contrib-command-iftraffic)
|
|
- make sure to include them in your [icinga2 configuration file](4-configuring-icinga-2.md#icinga2-conf).
|
|
|
|
|
|
> **Tip**
|
|
>
|
|
> Building configuration in that dynamic way requires detailed information
|
|
> of the generated objects. Use the `object list` [CLI command](8-cli-commands.md#cli-command-object)
|
|
> after successful [configuration validation](8-cli-commands.md#config-validation).
|
|
|
|
Verify that the apply-for-rule successfully created the service objects with the
|
|
inherited custom attributes:
|
|
|
|
# icinga2 daemon -C
|
|
# icinga2 object list --type Service --name *catalyst*
|
|
|
|
Object 'cisco-catalyst-6509-34!if-GigabitEthernet0/2' of type 'Service':
|
|
......
|
|
* vars
|
|
% = modified in '/etc/icinga2/conf.d/iftraffic.conf', lines 59:3-59:26
|
|
* iftraffic_bandwidth = 1
|
|
* iftraffic_community = "public"
|
|
% = modified in '/etc/icinga2/conf.d/iftraffic.conf', lines 53:3-53:65
|
|
* iftraffic_interface = "GigabitEthernet0/2"
|
|
% = modified in '/etc/icinga2/conf.d/iftraffic.conf', lines 49:3-49:43
|
|
* iftraffic_units = "g"
|
|
% = modified in '/etc/icinga2/conf.d/iftraffic.conf', lines 52:3-52:57
|
|
* qos = "disabled"
|
|
* vlan = "internal"
|
|
|
|
|
|
Object 'cisco-catalyst-6509-34!if-GigabitEthernet0/4' of type 'Service':
|
|
...
|
|
* vars
|
|
% = modified in '/etc/icinga2/conf.d/iftraffic.conf', lines 59:3-59:26
|
|
* iftraffic_bandwidth = 1
|
|
* iftraffic_community = "public"
|
|
% = modified in '/etc/icinga2/conf.d/iftraffic.conf', lines 53:3-53:65
|
|
% = modified in '/etc/icinga2/conf.d/iftraffic.conf', lines 79:5-79:53
|
|
* iftraffic_interface = "GigabitEthernet0/4"
|
|
% = modified in '/etc/icinga2/conf.d/iftraffic.conf', lines 49:3-49:43
|
|
* iftraffic_units = "g"
|
|
% = modified in '/etc/icinga2/conf.d/iftraffic.conf', lines 52:3-52:57
|
|
* qos = "enabled"
|
|
* vlan = "renote"
|
|
|
|
Object 'cisco-catalyst-6509-34!if-MgmtInterface1' of type 'Service':
|
|
...
|
|
* vars
|
|
% = modified in '/etc/icinga2/conf.d/iftraffic.conf', lines 59:3-59:26
|
|
* iftraffic_bandwidth = 1
|
|
% = modified in '/etc/icinga2/conf.d/iftraffic.conf', lines 66:5-66:32
|
|
* iftraffic_community = "public"
|
|
% = modified in '/etc/icinga2/conf.d/iftraffic.conf', lines 53:3-53:65
|
|
* iftraffic_interface = "MgmtInterface1"
|
|
% = modified in '/etc/icinga2/conf.d/iftraffic.conf', lines 49:3-49:43
|
|
* iftraffic_units = "m"
|
|
% = modified in '/etc/icinga2/conf.d/iftraffic.conf', lines 52:3-52:57
|
|
% = modified in '/etc/icinga2/conf.d/iftraffic.conf', lines 63:5-63:30
|
|
* interface_address = "127.99.0.100"
|
|
* qos = "not set"
|
|
% = modified in '/etc/icinga2/conf.d/iftraffic.conf', lines 72:5-72:24
|
|
* vlan = "mgmt"
|
|
|
|
|
|
### <a id="using-apply-object-attributes"></a> Use Object Attributes in Apply Rules
|
|
|
|
Since apply rules are evaluated after the generic objects, you
|
|
can reference existing host and/or service object attributes as
|
|
values for any object attribute specified in that apply rule.
|
|
|
|
object Host "opennebula-host" {
|
|
import "generic-host"
|
|
address = "10.1.1.2"
|
|
|
|
vars.hosting["xyz"] = {
|
|
http_uri = "/shop"
|
|
customer_name = "Customer xyz"
|
|
customer_id = "7568"
|
|
support_contract = "gold"
|
|
}
|
|
vars.hosting["abc"] = {
|
|
http_uri = "/shop"
|
|
customer_name = "Customer xyz"
|
|
customer_id = "7568"
|
|
support_contract = "silver"
|
|
}
|
|
}
|
|
|
|
apply Service for (customer => config in host.vars.hosting) {
|
|
import "generic-service"
|
|
check_command = "ping4"
|
|
|
|
vars.qos = "disabled"
|
|
|
|
vars += config
|
|
|
|
vars.http_uri = "/" + vars.customer + "/" + config.http_uri
|
|
|
|
display_name = "Shop Check for " + vars.customer_name + "-" + vars.customer_id
|
|
|
|
notes = "Support contract: " + vars.support_contract + " for Customer " + vars.customer_name + " (" + vars.customer_id + ")."
|
|
|
|
notes_url = "http://foreman.company.com/hosts/" + host.name
|
|
action_url = "http://snmp.checker.company.com/" + host.name + "/" + vars.customer_id
|
|
}
|
|
|
|
## <a id="groups"></a> Groups
|
|
|
|
A group is a collection of similar objects. Groups are primarily used as a
|
|
visualization aid in web interfaces.
|
|
|
|
Group membership is defined at the respective object itself. If
|
|
you have a hostgroup name `windows` for example, and want to assign
|
|
specific hosts to this group for later viewing the group on your
|
|
alert dashboard, first create a HostGroup object:
|
|
|
|
object HostGroup "windows" {
|
|
display_name = "Windows Servers"
|
|
}
|
|
|
|
Then add your hosts to this group:
|
|
|
|
template Host "windows-server" {
|
|
groups += [ "windows" ]
|
|
}
|
|
|
|
object Host "mssql-srv1" {
|
|
import "windows-server"
|
|
|
|
vars.mssql_port = 1433
|
|
}
|
|
|
|
object Host "mssql-srv2" {
|
|
import "windows-server"
|
|
|
|
vars.mssql_port = 1433
|
|
}
|
|
|
|
This can be done for service and user groups the same way:
|
|
|
|
object UserGroup "windows-mssql-admins" {
|
|
display_name = "Windows MSSQL Admins"
|
|
}
|
|
|
|
template User "generic-windows-mssql-users" {
|
|
groups += [ "windows-mssql-admins" ]
|
|
}
|
|
|
|
object User "win-mssql-noc" {
|
|
import "generic-windows-mssql-users"
|
|
|
|
email = "noc@example.com"
|
|
}
|
|
|
|
object User "win-mssql-ops" {
|
|
import "generic-windows-mssql-users"
|
|
|
|
email = "ops@example.com"
|
|
}
|
|
|
|
### <a id="group-assign-intro"></a> Group Membership Assign
|
|
|
|
Instead of manually assigning each object to a group you can also assign objects
|
|
to a group based on their attributes:
|
|
|
|
object HostGroup "prod-mssql" {
|
|
display_name = "Production MSSQL Servers"
|
|
|
|
assign where host.vars.mssql_port && host.vars.prod_mysql_db
|
|
ignore where host.vars.test_server == true
|
|
ignore where match("*internal", host.name)
|
|
}
|
|
|
|
In this example all hosts with the `vars` attribute `mssql_port`
|
|
will be added as members to the host group `mssql`. However, all `*internal`
|
|
hosts or with the `test_server` attribute set to `true` are not added to this
|
|
group.
|
|
|
|
Details on the `assign where` syntax can be found in the
|
|
[Language Reference](20-language-reference.md#apply)
|
|
|
|
## <a id="notifications"></a> Notifications
|
|
|
|
Notifications for service and host problems are an integral part of your
|
|
monitoring setup.
|
|
|
|
When a host or service is in a downtime, a problem has been acknowledged or
|
|
the dependency logic determined that the host/service is unreachable, no
|
|
notifications are sent. You can configure additional type and state filters
|
|
refining the notifications being actually sent.
|
|
|
|
There are many ways of sending notifications, e.g. by e-mail, XMPP,
|
|
IRC, Twitter, etc. On its own Icinga 2 does not know how to send notifications.
|
|
Instead it relies on external mechanisms such as shell scripts to notify users.
|
|
More notification methods are listed in the [addons and plugins](14-addons-plugins.md#notification-scripts-interfaces)
|
|
chapter.
|
|
|
|
A notification specification requires one or more users (and/or user groups)
|
|
who will be notified in case of problems. These users must have all custom
|
|
attributes defined which will be used in the `NotificationCommand` on execution.
|
|
|
|
The user `icingaadmin` in the example below will get notified only on `WARNING` and
|
|
`CRITICAL` states and `problem` and `recovery` notification types.
|
|
|
|
object User "icingaadmin" {
|
|
display_name = "Icinga 2 Admin"
|
|
enable_notifications = true
|
|
states = [ OK, Warning, Critical ]
|
|
types = [ Problem, Recovery ]
|
|
email = "icinga@localhost"
|
|
}
|
|
|
|
If you don't set the `states` and `types` configuration attributes for the `User`
|
|
object, notifications for all states and types will be sent.
|
|
|
|
Details on troubleshooting notification problems can be found [here](17-troubleshooting.md#troubleshooting).
|
|
|
|
> **Note**
|
|
>
|
|
> Make sure that the [notification](8-cli-commands.md#features) feature is enabled
|
|
> in order to execute notification commands.
|
|
|
|
You should choose which information you (and your notified users) are interested in
|
|
case of emergency, and also which information does not provide any value to you and
|
|
your environment.
|
|
|
|
An example notification command is explained [here](3-monitoring-basics.md#notification-commands).
|
|
|
|
You can add all shared attributes to a `Notification` template which is inherited
|
|
to the defined notifications. That way you'll save duplicated attributes in each
|
|
`Notification` object. Attributes can be overridden locally.
|
|
|
|
template Notification "generic-notification" {
|
|
interval = 15m
|
|
|
|
command = "mail-service-notification"
|
|
|
|
states = [ Warning, Critical, Unknown ]
|
|
types = [ Problem, Acknowledgement, Recovery, Custom, FlappingStart,
|
|
FlappingEnd, DowntimeStart, DowntimeEnd, DowntimeRemoved ]
|
|
|
|
period = "24x7"
|
|
}
|
|
|
|
The time period `24x7` is included as example configuration with Icinga 2.
|
|
|
|
Use the `apply` keyword to create `Notification` objects for your services:
|
|
|
|
apply Notification "notify-cust-xy-mysql" to Service {
|
|
import "generic-notification"
|
|
|
|
users = [ "noc-xy", "mgmt-xy" ]
|
|
|
|
assign where match("*has gold support 24x7*", service.notes) && (host.vars.customer == "customer-xy" || host.vars.always_notify == true
|
|
ignore where match("*internal", host.name) || (service.vars.priority < 2 && host.vars.is_clustered == true)
|
|
}
|
|
|
|
|
|
Instead of assigning users to notifications, you can also add the `user_groups`
|
|
attribute with a list of user groups to the `Notification` object. Icinga 2 will
|
|
send notifications to all group members.
|
|
|
|
> **Note**
|
|
>
|
|
> Only users who have been notified of a problem before (`Warning`, `Critical`, `Unknown`
|
|
> states for services, `Down` for hosts) will receive `Recovery` notifications.
|
|
|
|
### <a id="notification-escalations"></a> Notification Escalations
|
|
|
|
When a problem notification is sent and a problem still exists at the time of re-notification
|
|
you may want to escalate the problem to the next support level. A different approach
|
|
is to configure the default notification by email, and escalate the problem via SMS
|
|
if not already solved.
|
|
|
|
You can define notification start and end times as additional configuration
|
|
attributes making the `Notification` object a so-called `notification escalation`.
|
|
Using templates you can share the basic notification attributes such as users or the
|
|
`interval` (and override them for the escalation then).
|
|
|
|
Using the example from above, you can define additional users being escalated for SMS
|
|
notifications between start and end time.
|
|
|
|
object User "icinga-oncall-2nd-level" {
|
|
display_name = "Icinga 2nd Level"
|
|
|
|
vars.mobile = "+1 555 424642"
|
|
}
|
|
|
|
object User "icinga-oncall-1st-level" {
|
|
display_name = "Icinga 1st Level"
|
|
|
|
vars.mobile = "+1 555 424642"
|
|
}
|
|
|
|
Define an additional [NotificationCommand](3-monitoring-basics.md#notification-commands) for SMS notifications.
|
|
|
|
> **Note**
|
|
>
|
|
> The example is not complete as there are many different SMS providers.
|
|
> Please note that sending SMS notifications will require an SMS provider
|
|
> or local hardware with a SIM card active.
|
|
|
|
object NotificationCommand "sms-notification" {
|
|
command = [
|
|
PluginDir + "/send_sms_notification",
|
|
"$mobile$",
|
|
"..."
|
|
}
|
|
|
|
The two new notification escalations are added onto the local host
|
|
and its service `ping4` using the `generic-notification` template.
|
|
The user `icinga-oncall-2nd-level` will get notified by SMS (`sms-notification`
|
|
command) after `30m` until `1h`.
|
|
|
|
> **Note**
|
|
>
|
|
> The `interval` was set to 15m in the `generic-notification`
|
|
> template example. Lower that value in your escalations by using a secondary
|
|
> template or by overriding the attribute directly in the `notifications` array
|
|
> position for `escalation-sms-2nd-level`.
|
|
|
|
If the problem does not get resolved nor acknowledged preventing further notifications
|
|
the `escalation-sms-1st-level` user will be escalated `1h` after the initial problem was
|
|
notified, but only for one hour (`2h` as `end` key for the `times` dictionary).
|
|
|
|
apply Notification "mail" to Service {
|
|
import "generic-notification"
|
|
|
|
command = "mail-notification"
|
|
users = [ "icingaadmin" ]
|
|
|
|
assign where service.name == "ping4"
|
|
}
|
|
|
|
apply Notification "escalation-sms-2nd-level" to Service {
|
|
import "generic-notification"
|
|
|
|
command = "sms-notification"
|
|
users = [ "icinga-oncall-2nd-level" ]
|
|
|
|
times = {
|
|
begin = 30m
|
|
end = 1h
|
|
}
|
|
|
|
assign where service.name == "ping4"
|
|
}
|
|
|
|
apply Notification "escalation-sms-1st-level" to Service {
|
|
import "generic-notification"
|
|
|
|
command = "sms-notification"
|
|
users = [ "icinga-oncall-1st-level" ]
|
|
|
|
times = {
|
|
begin = 1h
|
|
end = 2h
|
|
}
|
|
|
|
assign where service.name == "ping4"
|
|
}
|
|
|
|
### <a id="notification-delay"></a> Notification Delay
|
|
|
|
Sometimes the problem in question should not be notified when the notification is due
|
|
(the object reaching the `HARD` state) but a defined time duration afterwards. In Icinga 2
|
|
you can use the `times` dictionary and set `begin = 15m` as key and value if you want to
|
|
postpone the notification window for 15 minutes. Leave out the `end` key - if not set,
|
|
Icinga 2 will not check against any end time for this notification. Make sure to
|
|
specify a relatively low notification `interval` to get notified soon enough again.
|
|
|
|
apply Notification "mail" to Service {
|
|
import "generic-notification"
|
|
|
|
command = "mail-notification"
|
|
users = [ "icingaadmin" ]
|
|
|
|
interval = 5m
|
|
|
|
times.begin = 15m // delay notification window
|
|
|
|
assign where service.name == "ping4"
|
|
}
|
|
|
|
### <a id="disable-renotification"></a> Disable Re-notifications
|
|
|
|
If you prefer to be notified only once, you can disable re-notifications by setting the
|
|
`interval` attribute to `0`.
|
|
|
|
apply Notification "notify-once" to Service {
|
|
import "generic-notification"
|
|
|
|
command = "mail-notification"
|
|
users = [ "icingaadmin" ]
|
|
|
|
interval = 0 // disable re-notification
|
|
|
|
assign where service.name == "ping4"
|
|
}
|
|
|
|
### <a id="notification-filters-state-type"></a> Notification Filters by State and Type
|
|
|
|
If there are no notification state and type filter attributes defined at the `Notification`
|
|
or `User` object Icinga 2 assumes that all states and types are being notified.
|
|
|
|
Available state and type filters for notifications are:
|
|
|
|
template Notification "generic-notification" {
|
|
|
|
states = [ Warning, Critical, Unknown ]
|
|
types = [ Problem, Acknowledgement, Recovery, Custom, FlappingStart,
|
|
FlappingEnd, DowntimeStart, DowntimeEnd, DowntimeRemoved ]
|
|
}
|
|
|
|
If you are familiar with Icinga 1.x `notification_options` please note that they have been split
|
|
into type and state to allow more fine granular filtering for example on downtimes and flapping.
|
|
You can filter for acknowledgements and custom notifications too.
|
|
|
|
|
|
## <a id="commands"></a> Commands
|
|
|
|
Icinga 2 uses three different command object types to specify how
|
|
checks should be performed, notifications should be sent, and
|
|
events should be handled.
|
|
|
|
### <a id="check-commands"></a> Check Commands
|
|
|
|
[CheckCommand](6-object-types.md#objecttype-checkcommand) objects define the command line how
|
|
a check is called.
|
|
|
|
[CheckCommand](6-object-types.md#objecttype-checkcommand) objects are referenced by
|
|
[Host](6-object-types.md#objecttype-host) and [Service](6-object-types.md#objecttype-service) objects
|
|
using the `check_command` attribute.
|
|
|
|
> **Note**
|
|
>
|
|
> Make sure that the [checker](8-cli-commands.md#features) feature is enabled in order to
|
|
> execute checks.
|
|
|
|
#### <a id="command-plugin-integration"></a> Integrate the Plugin with a CheckCommand Definition
|
|
|
|
[CheckCommand](6-object-types.md#objecttype-checkcommand) objects require the [ITL template](7-icinga-template-library.md#itl-plugin-check-command)
|
|
`plugin-check-command` to support native plugin based check methods.
|
|
|
|
Unless you have done so already, download your check plugin and put it
|
|
into the [PluginDir](4-configuring-icinga-2.md#constants-conf) directory. The following example uses the
|
|
`check_mysql` plugin contained in the Monitoring Plugins package.
|
|
|
|
The plugin path and all command arguments are made a list of
|
|
double-quoted string arguments for proper shell escaping.
|
|
|
|
Call the `check_disk` plugin with the `--help` parameter to see
|
|
all available options. Our example defines warning (`-w`) and
|
|
critical (`-c`) thresholds for the disk usage. Without any
|
|
partition defined (`-p`) it will check all local partitions.
|
|
|
|
icinga@icinga2 $ /usr/lib64/nagios/plugins/check_mysql --help
|
|
...
|
|
|
|
This program tests connections to a MySQL server
|
|
|
|
Usage:
|
|
check_mysql [-d database] [-H host] [-P port] [-s socket]
|
|
[-u user] [-p password] [-S] [-l] [-a cert] [-k key]
|
|
[-C ca-cert] [-D ca-dir] [-L ciphers] [-f optfile] [-g group]
|
|
|
|
Next step is to understand how [command parameters](3-monitoring-basics.md#command-passing-parameters)
|
|
are being passed from a host or service object, and add a [CheckCommand](6-object-types.md#objecttype-checkcommand)
|
|
definition based on these required parameters and/or default values.
|
|
|
|
Please continue reading in the [plugins section](14-addons-plugins.md#plugins) for additional integration examples.
|
|
|
|
#### <a id="command-passing-parameters"></a> Passing Check Command Parameters from Host or Service
|
|
|
|
Check command parameters are defined as custom attributes which can be accessed as runtime macros
|
|
by the executed check command.
|
|
|
|
The check command parameters for ITL provided plugin check command definitions are documented
|
|
[here](7-icinga-template-library.md#plugin-check-commands), for example
|
|
[disk](7-icinga-template-library.md#plugin-check-command-disk).
|
|
|
|
In order to practice passing command parameters you should [integrate your own plugin](3-monitoring-basics.md#command-plugin-integration).
|
|
|
|
The following example will use `check_mysql` provided by the [Monitoring Plugins installation](2-getting-started.md#setting-up-check-plugins).
|
|
|
|
Define the default check command custom attributes, for example `mysql_user` and `mysql_password`
|
|
(freely definable naming schema) and optional their default threshold values. You can
|
|
then use these custom attributes as runtime macros for [command arguments](3-monitoring-basics.md#command-arguments)
|
|
on the command line.
|
|
|
|
> **Tip**
|
|
>
|
|
> Use a common command type as prefix for your command arguments to increase
|
|
> readability. `mysql_user` helps understanding the context better than just
|
|
> `user` as argument.
|
|
|
|
The default custom attributes can be overridden by the custom attributes
|
|
defined in the host or service using the check command `my-mysql`. The custom attributes
|
|
can also be inherited from a parent template using additive inheritance (`+=`).
|
|
|
|
# vim /etc/icinga2/conf.d/commands.conf
|
|
|
|
object CheckCommand "my-mysql" {
|
|
import "plugin-check-command"
|
|
|
|
command = [ PluginDir + "/check_mysql" ] //constants.conf -> const PluginDir
|
|
|
|
arguments = {
|
|
"-H" = "$mysql_host$"
|
|
"-u" = {
|
|
required = true
|
|
value = "$mysql_user$"
|
|
}
|
|
"-p" = "$mysql_password$"
|
|
"-P" = "$mysql_port$"
|
|
"-s" = "$mysql_socket$"
|
|
"-a" = "$mysql_cert$"
|
|
"-d" = "$mysql_database$"
|
|
"-k" = "$mysql_key$"
|
|
"-C" = "$mysql_ca_cert$"
|
|
"-D" = "$mysql_ca_dir$"
|
|
"-L" = "$mysql_ciphers$"
|
|
"-f" = "$mysql_optfile$"
|
|
"-g" = "$mysql_group$"
|
|
"-S" = {
|
|
set_if = "$mysql_check_slave$"
|
|
description = "Check if the slave thread is running properly."
|
|
}
|
|
"-l" = {
|
|
set_if = "$mysql_ssl$"
|
|
description = "Use ssl encryption"
|
|
}
|
|
}
|
|
|
|
vars.mysql_check_slave = false
|
|
vars.mysql_ssl = false
|
|
vars.mysql_host = "$address$"
|
|
}
|
|
|
|
The check command definition also sets `mysql_host` to the `$address$` default value. You can override
|
|
this command parameter if for example your MySQL host is not running on the same server's ip address.
|
|
|
|
Make sure pass all required command parameters, such as `mysql_user`, `mysql_password` and `mysql_database`.
|
|
`MysqlUsername` and `MysqlPassword` are specified as [global constants](4-configuring-icinga-2.md#constants-conf)
|
|
in this example.
|
|
|
|
# vim /etc/icinga2/conf.d/services.conf
|
|
|
|
apply Service "mysql-icinga-db-health" {
|
|
import "generic-service"
|
|
|
|
check_command = "my-mysql"
|
|
|
|
vars.mysql_user = MysqlUsername
|
|
vars.mysql_password = MysqlPassword
|
|
|
|
vars.mysql_database = "icinga"
|
|
vars.mysql_host = "192.168.33.11"
|
|
|
|
assign where match("icinga2*", host.name)
|
|
ignore where host.vars.no_health_check == true
|
|
}
|
|
|
|
|
|
Take a different example: The example host configuration in [hosts.conf](4-configuring-icinga-2.md#hosts-conf)
|
|
also applies an `ssh` service check. Your host's ssh port is not the default `22`, but set to `2022`.
|
|
You can pass the command parameter as custom attribute `ssh_port` directly inside the service apply rule
|
|
inside [services.conf](4-configuring-icinga-2.md#services-conf):
|
|
|
|
apply Service "ssh" {
|
|
import "generic-service"
|
|
|
|
check_command = "ssh"
|
|
vars.ssh_port = 2022 //custom command parameter
|
|
|
|
assign where (host.address || host.address6) && host.vars.os == "Linux"
|
|
}
|
|
|
|
If you prefer this being configured at the host instead of the service, modify the host configuration
|
|
object instead. The runtime macro resolving order is described [here](3-monitoring-basics.md#macro-evaluation-order).
|
|
|
|
object Host NodeName {
|
|
...
|
|
vars.ssh_port = 2022
|
|
}
|
|
|
|
#### <a id="command-passing-parameters-apply-for"></a> Passing Check Command Parameters Using Apply For
|
|
|
|
The host `localhost` with the generated services from the `basic-partitions` dictionary (see
|
|
[apply for](3-monitoring-basics.md#using-apply-for) for details) checks a basic set of disk partitions
|
|
with modified custom attributes (warning thresholds at `10%`, critical thresholds at `5%`
|
|
free disk space).
|
|
|
|
The custom attribute `disk_partition` can either hold a single string or an array of
|
|
string values for passing multiple partitions to the `check_disk` check plugin.
|
|
|
|
object Host "my-server" {
|
|
import "generic-host"
|
|
address = "127.0.0.1"
|
|
address6 = "::1"
|
|
|
|
vars.local_disks["basic-partitions"] = {
|
|
disk_partitions = [ "/", "/tmp", "/var", "/home" ]
|
|
}
|
|
}
|
|
|
|
apply Service for (disk => config in host.vars.local_disks) {
|
|
import "generic-service"
|
|
check_command = "my-disk"
|
|
|
|
vars += config
|
|
|
|
vars.disk_wfree = "10%"
|
|
vars.disk_cfree = "5%"
|
|
}
|
|
|
|
|
|
More details on using arrays in custom attributes can be found in
|
|
[this chapter](3-monitoring-basics.md#custom-attributes).
|
|
|
|
|
|
#### <a id="command-arguments"></a> Command Arguments
|
|
|
|
By defining a check command line using the `command` attribute Icinga 2
|
|
will resolve all macros in the static string or array. Sometimes it is
|
|
required to extend the arguments list based on a met condition evaluated
|
|
at command execution. Or making arguments optional - only set if the
|
|
macro value can be resolved by Icinga 2.
|
|
|
|
object CheckCommand "check_http" {
|
|
import "plugin-check-command"
|
|
|
|
command = [ PluginDir + "/check_http" ]
|
|
|
|
arguments = {
|
|
"-H" = "$http_vhost$"
|
|
"-I" = "$http_address$"
|
|
"-u" = "$http_uri$"
|
|
"-p" = "$http_port$"
|
|
"-S" = {
|
|
set_if = "$http_ssl$"
|
|
}
|
|
"--sni" = {
|
|
set_if = "$http_sni$"
|
|
}
|
|
"-a" = {
|
|
value = "$http_auth_pair$"
|
|
description = "Username:password on sites with basic authentication"
|
|
}
|
|
"--no-body" = {
|
|
set_if = "$http_ignore_body$"
|
|
}
|
|
"-r" = "$http_expect_body_regex$"
|
|
"-w" = "$http_warn_time$"
|
|
"-c" = "$http_critical_time$"
|
|
"-e" = "$http_expect$"
|
|
}
|
|
|
|
vars.http_address = "$address$"
|
|
vars.http_ssl = false
|
|
vars.http_sni = false
|
|
}
|
|
|
|
The example shows the `check_http` check command defining the most common
|
|
arguments. Each of them is optional by default and will be omitted if
|
|
the value is not set. For example if the service calling the check command
|
|
does not have `vars.http_port` set, it won't get added to the command
|
|
line.
|
|
|
|
If the `vars.http_ssl` custom attribute is set in the service, host or command
|
|
object definition, Icinga 2 will add the `-S` argument based on the `set_if`
|
|
numeric value to the command line. String values are not supported.
|
|
|
|
If the macro value cannot be resolved, Icinga 2 will not add the defined argument
|
|
to the final command argument array. Empty strings for macro values won't omit
|
|
the argument.
|
|
|
|
That way you can use the `check_http` command definition for both, with and
|
|
without SSL enabled checks saving you duplicated command definitions.
|
|
|
|
Details on all available options can be found in the
|
|
[CheckCommand object definition](6-object-types.md#objecttype-checkcommand).
|
|
|
|
|
|
#### <a id="command-environment-variables"></a> Environment Variables
|
|
|
|
The `env` command object attribute specifies a list of environment variables with values calculated
|
|
from either runtime macros or custom attributes which should be exported as environment variables
|
|
prior to executing the command.
|
|
|
|
This is useful for example for hiding sensitive information on the command line output
|
|
when passing credentials to database checks:
|
|
|
|
object CheckCommand "mysql-health" {
|
|
import "plugin-check-command"
|
|
|
|
command = [
|
|
PluginDir + "/check_mysql"
|
|
]
|
|
|
|
arguments = {
|
|
"-H" = "$mysql_address$"
|
|
"-d" = "$mysql_database$"
|
|
}
|
|
|
|
vars.mysql_address = "$address$"
|
|
vars.mysql_database = "icinga"
|
|
vars.mysql_user = "icinga_check"
|
|
vars.mysql_pass = "password"
|
|
|
|
env.MYSQLUSER = "$mysql_user$"
|
|
env.MYSQLPASS = "$mysql_pass$"
|
|
}
|
|
|
|
|
|
|
|
### <a id="notification-commands"></a> Notification Commands
|
|
|
|
[NotificationCommand](6-object-types.md#objecttype-notificationcommand) objects define how notifications are delivered to external
|
|
interfaces (E-Mail, XMPP, IRC, Twitter, etc).
|
|
|
|
[NotificationCommand](6-object-types.md#objecttype-notificationcommand) objects are referenced by
|
|
[Notification](6-object-types.md#objecttype-notification) objects using the `command` attribute.
|
|
|
|
`NotificationCommand` objects require the [ITL template](7-icinga-template-library.md#itl-plugin-notification-command)
|
|
`plugin-notification-command` to support native plugin-based notifications.
|
|
|
|
> **Note**
|
|
>
|
|
> Make sure that the [notification](8-cli-commands.md#features) feature is enabled
|
|
> in order to execute notification commands.
|
|
|
|
Below is an example using runtime macros from Icinga 2 (such as `$service.output$` for
|
|
the current check output) sending an email to the user(s) associated with the
|
|
notification itself (`$user.email$`).
|
|
|
|
If you want to specify default values for some of the custom attribute definitions,
|
|
you can add a `vars` dictionary as shown for the `CheckCommand` object.
|
|
|
|
object NotificationCommand "mail-service-notification" {
|
|
import "plugin-notification-command"
|
|
|
|
command = [ SysconfDir + "/icinga2/scripts/mail-notification.sh" ]
|
|
|
|
env = {
|
|
NOTIFICATIONTYPE = "$notification.type$"
|
|
SERVICEDESC = "$service.name$"
|
|
HOSTALIAS = "$host.display_name$"
|
|
HOSTADDRESS = "$address$"
|
|
SERVICESTATE = "$service.state$"
|
|
LONGDATETIME = "$icinga.long_date_time$"
|
|
SERVICEOUTPUT = "$service.output$"
|
|
NOTIFICATIONAUTHORNAME = "$notification.author$"
|
|
NOTIFICATIONCOMMENT = "$notification.comment$"
|
|
HOSTDISPLAYNAME = "$host.display_name$"
|
|
SERVICEDISPLAYNAME = "$service.display_name$"
|
|
USEREMAIL = "$user.email$"
|
|
}
|
|
}
|
|
|
|
The command attribute in the `mail-service-notification` command refers to the following
|
|
shell script. The macros specified in the `env` array are exported
|
|
as environment variables and can be used in the notification script:
|
|
|
|
#!/usr/bin/env bash
|
|
template=$(cat <<TEMPLATE
|
|
***** Icinga *****
|
|
|
|
Notification Type: $NOTIFICATIONTYPE
|
|
|
|
Service: $SERVICEDESC
|
|
Host: $HOSTALIAS
|
|
Address: $HOSTADDRESS
|
|
State: $SERVICESTATE
|
|
|
|
Date/Time: $LONGDATETIME
|
|
|
|
Additional Info: $SERVICEOUTPUT
|
|
|
|
Comment: [$NOTIFICATIONAUTHORNAME] $NOTIFICATIONCOMMENT
|
|
TEMPLATE
|
|
)
|
|
|
|
/usr/bin/printf "%b" $template | mail -s "$NOTIFICATIONTYPE - $HOSTDISPLAYNAME - $SERVICEDISPLAYNAME is $SERVICESTATE" $USEREMAIL
|
|
|
|
> **Note**
|
|
>
|
|
> This example is for `exim` only. Requires changes for `sendmail` and
|
|
> other MTAs.
|
|
|
|
While it's possible to specify the entire notification command right
|
|
in the NotificationCommand object it is generally advisable to create a
|
|
shell script in the `/etc/icinga2/scripts` directory and have the
|
|
NotificationCommand object refer to that.
|
|
|
|
### <a id="event-commands"></a> Event Commands
|
|
|
|
Unlike notifications, event commands for hosts/services are called on every
|
|
check execution if one of these conditions match:
|
|
|
|
* The host/service is in a [soft state](3-monitoring-basics.md#hard-soft-states)
|
|
* The host/service state changes into a [hard state](3-monitoring-basics.md#hard-soft-states)
|
|
* The host/service state recovers from a [soft or hard state](3-monitoring-basics.md#hard-soft-states) to [OK](3-monitoring-basics.md#service-states)/[Up](3-monitoring-basics.md#host-states)
|
|
|
|
[EventCommand](6-object-types.md#objecttype-eventcommand) objects are referenced by
|
|
[Host](6-object-types.md#objecttype-host) and [Service](6-object-types.md#objecttype-service) objects
|
|
using the `event_command` attribute.
|
|
|
|
Therefore the `EventCommand` object should define a command line
|
|
evaluating the current service state and other service runtime attributes
|
|
available through runtime vars. Runtime macros such as `$service.state_type$`
|
|
and `$service.state$` will be processed by Icinga 2 helping on fine-granular
|
|
events being triggered.
|
|
|
|
Common use case scenarios are a failing HTTP check requiring an immediate
|
|
restart via event command, or if an application is locked and requires
|
|
a restart upon detection.
|
|
|
|
`EventCommand` objects require the ITL template `plugin-event-command`
|
|
to support native plugin based checks.
|
|
|
|
#### <a id="event-command-restart-service-daemon"></a> Use Event Commands to Restart Service Daemon
|
|
|
|
The following example will triggert a restart of the `httpd` daemon
|
|
via ssh when the `http` service check fails. If the service state is
|
|
`OK`, it will not trigger any event action.
|
|
|
|
Requirements:
|
|
|
|
* ssh connection
|
|
* icinga user with public key authentication
|
|
* icinga user with sudo permissions for restarting the httpd daemon.
|
|
|
|
Example on Debian:
|
|
|
|
# ls /home/icinga/.ssh/
|
|
authorized_keys
|
|
|
|
# visudo
|
|
icinga ALL=(ALL) NOPASSWD: /etc/init.d/apache2 restart
|
|
|
|
|
|
Define a generic [EventCommand](6-object-types.md#objecttype-eventcommand) object `event_by_ssh`
|
|
which can be used for all event commands triggered using ssh:
|
|
|
|
/* pass event commands through ssh */
|
|
object EventCommand "event_by_ssh" {
|
|
import "plugin-event-command"
|
|
|
|
command = [ PluginDir + "/check_by_ssh" ]
|
|
|
|
arguments = {
|
|
"-H" = "$event_by_ssh_address$"
|
|
"-p" = "$event_by_ssh_port$"
|
|
"-C" = "$event_by_ssh_command$"
|
|
"-l" = "$event_by_ssh_logname$"
|
|
"-i" = "$event_by_ssh_identity$"
|
|
"-q" = {
|
|
set_if = "$event_by_ssh_quiet$"
|
|
}
|
|
"-w" = "$event_by_ssh_warn$"
|
|
"-c" = "$event_by_ssh_crit$"
|
|
"-t" = "$event_by_ssh_timeout$"
|
|
}
|
|
|
|
vars.event_by_ssh_address = "$address$"
|
|
vars.event_by_ssh_quiet = false
|
|
}
|
|
|
|
The actual event command only passes the `event_by_ssh_command` attribute.
|
|
The `event_by_ssh_service` custom attribute takes care of passing the correct
|
|
daemon name, while `test $service.state_id$ -gt 0` makes sure that the daemon
|
|
is only restarted when the service is not in an `OK` state.
|
|
|
|
|
|
object EventCommand "event_by_ssh_restart_service" {
|
|
import "event_by_ssh"
|
|
|
|
//only restart the daemon if state > 0 (not-ok)
|
|
//requires sudo permissions for the icinga user
|
|
vars.event_by_ssh_command = "test $service.state_id$ -gt 0 && sudo /etc/init.d/$event_by_ssh_service$ restart"
|
|
}
|
|
|
|
|
|
Now set the `event_command` attribute to `event_by_ssh_restart_service` and tell it
|
|
which service should be restarted using the `event_by_ssh_service` attribute.
|
|
|
|
object Service "http" {
|
|
import "generic-service"
|
|
host_name = "remote-http-host"
|
|
check_command = "http"
|
|
|
|
event_command = "event_by_ssh_restart_service"
|
|
vars.event_by_ssh_service = "$host.vars.httpd_name$"
|
|
|
|
//vars.event_by_ssh_logname = "icinga"
|
|
//vars.event_by_ssh_identity = "/home/icinga/.ssh/id_rsa.pub"
|
|
}
|
|
|
|
|
|
Each host with this service then must define the `httpd_name` custom attribute
|
|
(for example generated from your cmdb):
|
|
|
|
object Host "remote-http-host" {
|
|
import "generic-host"
|
|
address = "192.168.1.100"
|
|
|
|
vars.httpd_name = "apache2"
|
|
}
|
|
|
|
You can testdrive this example by manually stopping the `httpd` daemon
|
|
on your `remote-http-host`. Enable the `debuglog` feature and tail the
|
|
`/var/log/icinga2/debug.log` file.
|
|
|
|
Remote Host Terminal:
|
|
|
|
# date; service apache2 status
|
|
Mon Sep 15 18:57:39 CEST 2014
|
|
Apache2 is running (pid 23651).
|
|
# date; service apache2 stop
|
|
Mon Sep 15 18:57:47 CEST 2014
|
|
[ ok ] Stopping web server: apache2 ... waiting .
|
|
|
|
Icinga 2 Host Terminal:
|
|
|
|
[2014-09-15 18:58:32 +0200] notice/Process: Running command '/usr/lib64/nagios/plugins/check_http' '-I' '192.168.1.100': PID 32622
|
|
[2014-09-15 18:58:32 +0200] notice/Process: PID 32622 ('/usr/lib64/nagios/plugins/check_http' '-I' '192.168.1.100') terminated with exit code 2
|
|
[2014-09-15 18:58:32 +0200] notice/Checkable: State Change: Checkable remote-http-host!http soft state change from OK to CRITICAL detected.
|
|
[2014-09-15 18:58:32 +0200] notice/Checkable: Executing event handler 'event_by_ssh_restart_service' for service 'remote-http-host!http'
|
|
[2014-09-15 18:58:32 +0200] notice/Process: Running command '/usr/lib64/nagios/plugins/check_by_ssh' '-C' 'test 2 -gt 0 && sudo /etc/init.d/apache2 restart' '-H' '192.168.1.100': PID 32623
|
|
[2014-09-15 18:58:33 +0200] notice/Process: PID 32623 ('/usr/lib64/nagios/plugins/check_by_ssh' '-C' 'test 2 -gt 0 && sudo /etc/init.d/apache2 restart' '-H' '192.168.1.100') terminated with exit code 0
|
|
|
|
Remote Host Terminal:
|
|
|
|
# date; service apache2 status
|
|
Mon Sep 15 18:58:44 CEST 2014
|
|
Apache2 is running (pid 24908).
|
|
|
|
|
|
## <a id="dependencies"></a> Dependencies
|
|
|
|
Icinga 2 uses host and service [Dependency](6-object-types.md#objecttype-dependency) objects
|
|
for determing their network reachability.
|
|
|
|
A service can depend on a host, and vice versa. A service has an implicit
|
|
dependency (parent) to its host. A host to host dependency acts implicitly
|
|
as host parent relation.
|
|
When dependencies are calculated, not only the immediate parent is taken into
|
|
account but all parents are inherited.
|
|
|
|
The `parent_host_name` and `parent_service_name` attributes are mandatory for
|
|
service dependencies, `parent_host_name` is required for host dependencies.
|
|
[Apply rules](3-monitoring-basics.md#using-apply) will allow you to
|
|
[determine these attributes](3-monitoring-basics.md#dependencies-apply-custom-attributes) in a more
|
|
dynamic fashion if required.
|
|
|
|
parent_host_name = "core-router"
|
|
parent_service_name = "uplink-port"
|
|
|
|
Notifications are suppressed by default if a host or service becomes unreachable.
|
|
You can control that option by defining the `disable_notifications` attribute.
|
|
|
|
disable_notifications = false
|
|
|
|
If the dependency should be triggered in the parent object's soft state, you
|
|
need to set `ignore_soft_states` to `false`.
|
|
|
|
The dependency state filter must be defined based on the parent object being
|
|
either a host (`Up`, `Down`) or a service (`OK`, `Warning`, `Critical`, `Unknown`).
|
|
|
|
The following example will make the dependency fail and trigger it if the parent
|
|
object is **not** in one of these states:
|
|
|
|
states = [ OK, Critical, Unknown ]
|
|
|
|
Rephrased: If the parent service object changes into the `Warning` state, this
|
|
dependency will fail and render all child objects (hosts or services) unreachable.
|
|
|
|
You can determine the child's reachability by querying the `is_reachable` attribute
|
|
in for example [DB IDO](23-appendix.md#schema-db-ido-extensions).
|
|
|
|
### <a id="dependencies-implicit-host-service"></a> Implicit Dependencies for Services on Host
|
|
|
|
Icinga 2 automatically adds an implicit dependency for services on their host. That way
|
|
service notifications are suppressed when a host is `DOWN` or `UNREACHABLE`. This dependency
|
|
does not overwrite other dependencies and implicitely sets `disable_notifications = true` and
|
|
`states = [ Up ]` for all service objects.
|
|
|
|
Service checks are still executed. If you want to prevent them from happening, you can
|
|
apply the following dependency to all services setting their host as `parent_host_name`
|
|
and disabling the checks. `assign where true` matches on all `Service` objects.
|
|
|
|
apply Dependency "disable-host-service-checks" to Service {
|
|
disable_checks = true
|
|
assign where true
|
|
}
|
|
|
|
### <a id="dependencies-network-reachability"></a> Dependencies for Network Reachability
|
|
|
|
A common scenario is the Icinga 2 server behind a router. Checking internet
|
|
access by pinging the Google DNS server `google-dns` is a common method, but
|
|
will fail in case the `dsl-router` host is down. Therefore the example below
|
|
defines a host dependency which acts implicitly as parent relation too.
|
|
|
|
Furthermore the host may be reachable but ping probes are dropped by the
|
|
router's firewall. In case the `dsl-router`'s `ping4` service check fails, all
|
|
further checks for the `ping4` service on host `google-dns` service should
|
|
be suppressed. This is achieved by setting the `disable_checks` attribute to `true`.
|
|
|
|
object Host "dsl-router" {
|
|
import "generic-host"
|
|
address = "192.168.1.1"
|
|
}
|
|
|
|
object Host "google-dns" {
|
|
import "generic-host"
|
|
address = "8.8.8.8"
|
|
}
|
|
|
|
apply Service "ping4" {
|
|
import "generic-service"
|
|
|
|
check_command = "ping4"
|
|
|
|
assign where host.address
|
|
}
|
|
|
|
apply Dependency "internet" to Host {
|
|
parent_host_name = "dsl-router"
|
|
disable_checks = true
|
|
disable_notifications = true
|
|
|
|
assign where host.name != "dsl-router"
|
|
}
|
|
|
|
apply Dependency "internet" to Service {
|
|
parent_host_name = "dsl-router"
|
|
parent_service_name = "ping4"
|
|
disable_checks = true
|
|
|
|
assign where host.name != "dsl-router"
|
|
}
|
|
|
|
### <a id="dependencies-apply-custom-attributes"></a> Apply Dependencies based on Custom Attributes
|
|
|
|
You can use [apply rules](3-monitoring-basics.md#using-apply) to set parent or
|
|
child attributes e.g. `parent_host_name` to other object's
|
|
attributes.
|
|
|
|
A common example are virtual machines hosted on a master. The object
|
|
name of that master is auto-generated from your CMDB or VMWare inventory
|
|
into the host's custom attributes (or a generic template for your
|
|
cloud).
|
|
|
|
Define your master host object:
|
|
|
|
/* your master */
|
|
object Host "master.example.com" {
|
|
import "generic-host"
|
|
}
|
|
|
|
Add a generic template defining all common host attributes:
|
|
|
|
/* generic template for your virtual machines */
|
|
template Host "generic-vm" {
|
|
import "generic-host"
|
|
}
|
|
|
|
Add a template for all hosts on your example.com cloud setting
|
|
custom attribute `vm_parent` to `master.example.com`:
|
|
|
|
template Host "generic-vm-example.com" {
|
|
import "generic-vm"
|
|
vars.vm_parent = "master.example.com"
|
|
}
|
|
|
|
Define your guest hosts:
|
|
|
|
object Host "www.example1.com" {
|
|
import "generic-vm-master.example.com"
|
|
}
|
|
|
|
object Host "www.example2.com" {
|
|
import "generic-vm-master.example.com"
|
|
}
|
|
|
|
Apply the host dependency to all child hosts importing the
|
|
`generic-vm` template and set the `parent_host_name`
|
|
to the previously defined custom attribute `host.vars.vm_parent`.
|
|
|
|
apply Dependency "vm-host-to-parent-master" to Host {
|
|
parent_host_name = host.vars.vm_parent
|
|
assign where "generic-vm" in host.templates
|
|
}
|
|
|
|
You can extend this example, and make your services depend on the
|
|
`master.example.com` host too. Their local scope allows you to use
|
|
`host.vars.vm_parent` similar to the example above.
|
|
|
|
apply Dependency "vm-service-to-parent-master" to Service {
|
|
parent_host_name = host.vars.vm_parent
|
|
assign where "generic-vm" in host.templates
|
|
}
|
|
|
|
That way you don't need to wait for your guest hosts becoming
|
|
unreachable when the master host goes down. Instead the services
|
|
will detect their reachability immediately when executing checks.
|
|
|
|
> **Note**
|
|
>
|
|
> This method with setting locally scoped variables only works in
|
|
> apply rules, but not in object definitions.
|
|
|
|
|
|
### <a id="dependencies-agent-checks"></a> Dependencies for Agent Checks
|
|
|
|
Another classic example are agent based checks. You would define a health check
|
|
for the agent daemon responding to your requests, and make all other services
|
|
querying that daemon depend on that health check.
|
|
|
|
The following configuration defines two nrpe based service checks `nrpe-load`
|
|
and `nrpe-disk` applied to the `nrpe-server`. The health check is defined as
|
|
`nrpe-health` service.
|
|
|
|
apply Service "nrpe-health" {
|
|
import "generic-service"
|
|
check_command = "nrpe"
|
|
assign where match("nrpe-*", host.name)
|
|
}
|
|
|
|
apply Service "nrpe-load" {
|
|
import "generic-service"
|
|
check_command = "nrpe"
|
|
vars.nrpe_command = "check_load"
|
|
assign where match("nrpe-*", host.name)
|
|
}
|
|
|
|
apply Service "nrpe-disk" {
|
|
import "generic-service"
|
|
check_command = "nrpe"
|
|
vars.nrpe_command = "check_disk"
|
|
assign where match("nrpe-*", host.name)
|
|
}
|
|
|
|
object Host "nrpe-server" {
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import "generic-host"
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address = "192.168.1.5"
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}
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apply Dependency "disable-nrpe-checks" to Service {
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parent_service_name = "nrpe-health"
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states = [ OK ]
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disable_checks = true
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disable_notifications = true
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assign where service.check_command == "nrpe"
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ignore where service.name == "nrpe-health"
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}
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The `disable-nrpe-checks` dependency is applied to all services
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on the `nrpe-service` host using the `nrpe` check_command attribute
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but not the `nrpe-health` service itself.
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